Garage door frame slumping.

So I noticed shortly after buying my house that there was a bit of a sag along the top of my garage door frame. It's kind of tricky to spot, but it's definitely there, as evidenced by my gutter sagging and dumping rain water out as well. I had a contractor out to look at quoting me on a new garage door, and he wasn't even interested in the job, stating that it was a major structural problem that would have to be fixed. Here's some pictures-

A couple of theories are that I could get a basement jack and jack the center of that top plate up slowly over a couple of weeks. Shim it up and then pull the drywall down in the garage and brace it somehow.
Another concern was that would simply bandaid the problem and that I would need to tear out the garage door frame, take off the siding and completely start over reframing the front of the garage. Any ideas?

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Garage door frame slumping.

Post a picture of the header over the garage door. Also measure the dimensions of the header, and the span of the header. It looks like the garage door header may be directly supporting the roof trusses, possibly the header is undersized.

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Garage door frame slumping.

The beam across the garage door was either undersized or has become compromised. That beam will need to be replaced. You can do this without a total gut and go, but will surely require a temporary shoring wall, an engineer and his calculations for a new beam size, and an insured contractor to do it...

Garage door frame slumping.

I'm interested in seeing what that header looks like.....I have a feeling this thread could be the poster child for properly sized headers....especially with the recent spat of header span questions....

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Even if you are on the right track, you will still get run over if you just sit there.

Garage door frame slumping.

Garage door frame slumping.

Ok, this picture probably isn't going to make much sense. I had to get right up to it to get a picture of it. The transparency of the garage door had full sun shining thru and made it impossible to get a shot from further back. If you can't see anything I'll take a picture after dark-

Garage door frame slumping.

I suspect 12 penny is correct, although I would not bet my last dollar on the plywood. You need to determine how many 2x10s there are, and if there is a filler piece such as plywood between the 2x10s. Also, measure the 2x10 to determine the exact height of the 2x10, typically they are 9-1/4 inches, but there is some variation.